:root {
  --bg: #242225;
  --line: #514d53;
  --text: #e8e4e6;
  --muted: #9d969c;
  --max-width: 1500px;
}

* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: var(--bg);
}
a { color: inherit; }

.detail-shell {
  width: min(calc(100% - 80px), var(--max-width));
  margin: 0 auto;
  background: var(--bg);
  min-height: 100vh;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);

  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 22px;
  border-bottom: 1px solid var(--line);
}
.brand { text-decoration: none; font-size: 13px; color: #d7d2d5; }
.main-nav { display: flex; align-items: center; gap: 34px; }
.main-nav a { text-decoration: none; color: var(--muted); font-size: 12px; padding: 5px 8px; }
.main-nav a:hover, .main-nav a:focus-visible, .main-nav a.is-active { color: var(--text); background: #353136; outline: none; }

.project-header {
  padding: 32px 36px 22px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  align-items: flex-end;
}
.project-header h1 {
  margin: 0;
  font-size: clamp(26px, 3vw, 46px);
  line-height: 1;
  font-weight: 400;
  letter-spacing: 0.04em;
}
.project-header p {
  margin: 0;
  color: var(--muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.project-gallery {
  padding: 0 36px 42px;
  display: grid;
  gap: 18px;
}
.project-gallery figure { margin: 0; }
.project-gallery img {
  display: block;
  width: 100%;
  height: auto;
  background: #171518;
}

.back-row {
  padding: 0 36px 34px;
  display: flex;
  justify-content: flex-end;
}
.back-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 12px;
}
.back-link:hover, .back-link:focus-visible { color: var(--text); }

@media (max-width: 900px) {
  .detail-shell { width: calc(100% - 28px); margin: 0 auto; }
  .site-header { height: auto; min-height: 56px; gap: 20px; flex-wrap: wrap; padding: 14px 18px; }
  .main-nav { gap: 12px; flex-wrap: wrap; }
  .project-header { padding: 26px 22px 18px; }
  .project-gallery { padding: 0 22px 30px; gap: 14px; }
  .back-row { padding: 0 22px 26px; }
}

@media (max-width: 620px) {
  .detail-shell { width: 100%; margin: 0; min-height: 100vh; }
  .main-nav { width: 100%; gap: 8px; }
  .project-header { align-items: flex-start; flex-direction: column; gap: 8px; padding: 24px 14px 16px; }
  .project-gallery { padding: 0 14px 24px; gap: 10px; }
  .back-row { padding: 0 14px 22px; }
}

/* Portfolio category disclosure in the shared header. */
.portfolio-menu { position: relative; }
.portfolio-menu summary {
  display: flex; align-items: center; gap: 7px;
  padding: 5px 8px; color: var(--muted); font-size: 12px;
  cursor: pointer; list-style: none;
}
.portfolio-menu summary::-webkit-details-marker { display: none; }
.portfolio-menu summary::after {
  content: ""; width: 5px; height: 5px;
  border-right: 1px solid currentColor; border-bottom: 1px solid currentColor;
  transform: translateY(-2px) rotate(45deg);
}
.portfolio-menu[open] summary::after { transform: translateY(1px) rotate(225deg); }
.portfolio-menu summary:hover, .portfolio-menu summary:focus-visible,
.portfolio-menu[open] summary, .portfolio-menu.is-active summary {
  color: var(--text); background: #353136;
}
.portfolio-menu summary:focus-visible { outline: 1px solid var(--text); outline-offset: 2px; }
.portfolio-options {
  position: absolute; top: calc(100% + 8px); left: 0; z-index: 101;
  width: 190px; max-width: calc(100vw - 40px); padding: 6px;
  background: var(--bg); border: 1px solid var(--line);
  box-shadow: 0 8px 20px rgba(0,0,0,.25);
}
.main-nav .portfolio-options a { display: block; padding: 12px; font-size: 14px; }